Safety appliance.



J. SE'VERANCE.

SAFETY APPLIANCE.

APPLICATION FILED MAR.24,1913.

1,1033% Patented July 14,1914

WITNESSES: V IN VENTOR.

. $01 212 fieverazwe.

A TTORNE Y.

I ED STATES PATENT OFFICE.

JOHN SEYERANCE, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO MILTON BRADLEY COMPANY, OF SPRINGFI OF MASSACHUSETTS.

ELD, MASSACHUSETTS, A CORPORATION SAFETY APPLIANCE.

Specification of Letters Patent.

' Patented July 14., 1914..

Application filed March 24, 1913. Serial No. 756,454.

To all whom it may concern Be. it known that 1, JOHN SEVERANGE, a citizen of the United States of America, residing at Springfield, in the .county of Hampden and State of Massachusetts, have invented newand useful Improvements in Safety Appliances, of which the following is a specification.

This invention relates to a safety device for use with power machines. It is especially adapted for machines such as are set in operation by an intermittent operation of a foot treadle.

Such -machines are wellknown in all lines of manufacture. The more common examples are the ordinary foot-press andbox-staying machines.

While the invention is especially useful for machines of the special class mentioned,

-the elements of the invention may be applied, broadly, to machines of many'difl'erent classes.

- i The special object of the With these objects in view, applicant shows in the accompanying drawings. a preferred form of his invention for the purpose. of illustrating one way in which the invention may be carried out.

Referring-to the drawings,-.'Figure 1 is a plan view'of the essential features of the safety device separated from the machine,

parts of the machine being shown in section. Flg. 2 is a side view of a machine to which the invention may be applied with partsbroken away to better show the arrange ment of the locking device with, relation to the machine.

The machine shown for the purpose of illustration is any well-known form of treadle-operated mechanism. In this particular instance, a box-staying machine is indicated. The applicant makes no claim whatever to the machine itself and calls attention to the fact that the invention, as

,other machine, so that the operating cants device is particularly designe shown applied to the machine, is only for the purposes of illustrating the invention and not with any idea of limiting the invention to the specific form shown.

Referring to Fig. 2, (1 .represents the boxstaying machine of a well-known form in which the driving-pulley e operates to rotate a shaft 9 when connected to the same by means of a clutch-f. The shaft 9 has mechanism arranged which operates in connection with the slide it to reciprocate the movable member 6 which cooperates with the stationary member y to "do-the work desired.

The clutch is operated by means of a foottreadle b which normally is in an upper position, due to spring Z on rod 0, and, when operated, takes a lower position in order to turn the bell-crank-lever d on its pivot and cause the'clutch f to connect pulley c with the shaft 9 so that the latter will be driven.

, The clutch f is the well-known form such as is used in foot-presses and in punch-presses as well as in devices of the character shown.

Whenever it isnecessary to make any repairs on the machine or adjust the same while the pulley e is running, the ordinary method is for the operator to merely remove his foot from the treadle b and go about making the necessary repairs or adjustments. The danger in this methodmesides in the fact' that the foot-treadle b, or a corresponding part in another machine, is liable, at any time, to be accidentally operated, thus immediately throwing the clutch f, or its corresponding part in anparts go through one cycle of operations. This the cause of many accidents, due to the un expected operation of the; parts, and-appliaccidental throwing ofthe' clutch f has been avoid the possibility of such accidental and unexpected operation.

will now be described. 'Fastened-to the underside of the tableplate of the machine is a casting is, formed as shown inthe drawings, which is supported by means of bolts n and 0 .which pass through elongated slots in the casting is, as shown in Fig. 1. The enlarged ends of these bolts'hold the casting 7: in place and allow a limited horizontal movement in a crosswise direction of the machine. tened to the end of the casting is is a spring The specific device shown in the drawings I Fasm which is also fastened to the frame a of the machine. This spring acts normally to clutch f in the manner described. Assumingthat the operator desires to make some repairs or adjustments .in-the machine, the following operations take place inorder to set the parts as shown in Fig. 2 into locking position. The operator takes. hold of the handle 9 and slides the casting is toward the front of the machine, such movement being limited by the slots through which the bolts 11. and 0 pass. This action takes place against the force of the spring m. Fastened to the handle 9 is a small pin 8, as indicated in Fig. 2, which cooperates with a notch in vthe loosely-pivoted arm 7, whose inner end is pivoted at a point on the lower end of the bolt n. The forward end of this arm 9 is made into a handle 7' for convenient manipulation. The end of the arm p, as it rides on the pin 8, will cause the notch in the arm 72 to embrace the pin .9 in the handle 9 as soon as this pin is pulled to the proper position. When the parts have been set, as shown in Fig. 2, the operating rod 0 extends through a narrow throat portion 3 extending from the hole 2 to the end of the casting is. With the rod'c extending through this slot, the nut ocannot move downwardly for the shoulders of the nut rest on the top of the casting 70. Thus, it is impossible, with I the parts in the position described, to press 40 the foot on the treadle b and lower the rod 0. The repairs and adjustments necessary are then made, and, when the operator desires to again start the machine, it is necessary to reach his hand under the machine and take hold of the handle portion 1' and lift the lever p in order to release the pin 8 from the 'slot.' The spring m will immediately return the casting is to its rearmost position,

as shown in full lines in Fig. 1, in which position the parts are all ready to operate.

By the arrangement described, it will be seen that the entire machine can be very conveniently locked whenever, desired, and,

after it has been locked, there is little or no operating said clutch, normally inoperative means for locking said rod in inoperative position, means for shifting said first named means to locking position, means for locking said means in said locking position, and means for moving said rod locking means back to inoperative position upon release of said last named lockmg means.

2. An apparatus of the class described, comprising, in combination, an operable machine, a clutch therein arranged to start a cycle of operations when moved in one di rection, a rod having an abutting part movable to shift said clutch, a locking-device having an abutting part movable into position to prevent the shifting movement of the rod by contact with its abutting part, means to normally hold the locking-device in inoperative position, and an automatic device to hold the locking-device in operative position when moved to that position, said automatic device being arranged to be released at will and permit the locking-device to assume a normal position, all for. the purpose described.

JOHN SEVERANOE.

I Witnesses:

F. G. NEAL, A. HUNTER. 

